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Agent skill

Nix Playwright

by srid in srid/emanote

Use this when adding Nix-based local runs for an existing Playwright e2e suite.

Custom licenceAuto-check passedTesting & QA

Install Nix Playwright

skills CLI
$ npx skills add srid/emanote --skill nix-playwright -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install srid/emanote nix-playwright --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/srid/emanote.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/nix-playwright .claude/skills/nix-playwright && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
nix-playwright
GitHub stars
963
Token cost
~557 tokens
SKILL.md length
174 words
Files
1
Skills in repo
25
Repo updated
First seen
Licence
Custom licence

At a glance

Use this when adding Nix-based local runs for an existing Playwright e2e suite.

  • Works in 3 steps: nix flake update nixpkgs-latest → Match playwright in tests/package.json… → npm install in tests/ to regenerate the…
  • Tasks that involve Browser testing
  • SKILL.md covers Add a nixpkgs-latest flake input, tests/shell.nix, Justfile recipe and Critical version constraint, plus 1 more section
  • Calls nix and npm

What it does

Nix Playwright is an agent skill from srid/emanote. Use this when adding Nix-based local runs for an existing Playwright e2e suite. Provides a self-contained tests/shell.nix that uses nixpkgs-latest for playwright-driver.browsers, plus a justfile entry — works on NixOS where npx playwright install --with-deps cannot.

Its SKILL.md is about 560 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Browser testing and End-to-end testing. It works with Playwright and npm. The repository describes itself as: Emanate a structured view of your plain-text notes.

When your agent uses it

  • Tasks that involve Browser testing
  • Tasks that involve End-to-end testing

Example prompts

  • “/nix-playwright”

Requirements

  • Node.js

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. nix flake update nixpkgs-latest
  2. Match playwright in tests/package.json to the new driver version
  3. npm install in tests/ to regenerate the lockfile

What it can do on your machine

Read from SKILL.md and the folder at commit 9d01037. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • nix
    • npm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Nix Playwright loads about 557 tokens when it runs. Until then it costs about 72 tokens; SKILL.md has 174 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~72
When it runs · the whole SKILL.md, loaded when a task matches
~557

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 174 words (~557 tokens).

“For projects that already have a Playwright e2e suite (typically under tests/) and need it to run locally on NixOS / pure-Nix hosts, where Playwright's bundled Chromium download depends on apt-get + sudo.”

— opening of SKILL.md by srid, Custom licence
name
nix-playwright

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/nix-playwright of srid/emanote.

Open the folder on GitHubat commit 9d01037

Compare with similar skills

Nix Playwright next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Nix Playwright compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Nix Playwright this skillsrid/emanote963—~557Automated safety check: PassCustom licence
PlaywrightKiln-AI/Kiln5.2k—~1.3kAutomated safety check: PassCustom licence
Proxy Setupasmyshlyaev177/test-proxy-recorder112—~4.3kAutomated safety check: PassMIT
Dev Webtestclassmethod/tsumiki974—~4.2kAutomated safety check: PassMIT
Pw Initalirezarezvani/claude-skills28k1 repos~1.2kAutomated safety check: PassMIT
Run Dashboard E2E Local ChangesBlackBeltTechnology/pi-agent-dashboard315—~1.3kAutomated safety check: PassMIT

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Works with

Categories

Questions about Nix Playwright

What does Nix Playwright do?

Use this when adding Nix-based local runs for an existing Playwright e2e suite. Nix Playwright is an agent skill from srid/emanote. Use this when adding Nix-based local runs for an existing Playwright e2e suite.

When should I use Nix Playwright?

Nix Playwright fits situations like: tasks that involve Browser testing; tasks that involve End-to-end testing.

How do I install Nix Playwright in Claude Code?

Run `npx skills add srid/emanote --skill nix-playwright -a claude-code`. Or copy the skill folder (.agents/skills/nix-playwright in srid/emanote) into .claude/skills/nix-playwright in your project. Claude Code loads it when a task matches its description.

How do I install Nix Playwright in Codex?

Run `npx skills add srid/emanote --skill nix-playwright -a codex`. Or copy the skill folder (.agents/skills/nix-playwright in srid/emanote) into .agents/skills/nix-playwright in your project. Codex loads it when a task matches its description.

Can I use Nix Playwright in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add srid/emanote --skill nix-playwright -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/nix-playwright, .gemini/skills/nix-playwright, .github/skills/nix-playwright and .opencode/skills/nix-playwright in your project.

What does Nix Playwright need to run?

Going by SKILL.md and its folder, Nix Playwright needs the command-line tools its instructions call (nix and npm). Our summary lists: Node.js.

Does Nix Playwright access the network?

SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Nix Playwright safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Nix Playwright use?

Nix Playwright has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Nix Playwright use?

About 557 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Nix Playwright?

Skills that share tags, products or a category with Nix Playwright: Playwright (Kiln-AI/Kiln, 5.2k stars), Proxy Setup (asmyshlyaev177/test-proxy-recorder, 112 stars), Dev Webtest (classmethod/tsumiki, 974 stars) and Pw Init (alirezarezvani/claude-skills, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nix Playwright?

srid (a GitHub user) maintains it in srid/emanote, which has 963 GitHub stars. The repository holds 25 skills in this directory. The repository was last updated on July 26, 2026.

Source: srid/emanote on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.